Will take your word for it and connect the turbo. As for the copper gasket, the compression is good, no leaks, no oil in water or water in oil, so my guess is - so far so good. I'll re-tighten the head bolts after a few 1000 km.
The trouble with the turbo is that I'm not running a BOV and didn't want to introduce too much resistance to the compressor = surge.
Appreciate the advice!
EDIT: In the clip, you can hear a metallic noise that could sound like knock, but it's actually two metallic tighteners on the exhaust pipe rattling about... That was the first thing I was worried about!